Describe the bug
WA editor right side pane becomes blank when selecting a WA
or
WA becomes completely uneditable

Do you have an error log of what happened?
error example 1 Message: Interface\AddOns\WeakAuras\Prototypes.lua:727: bad argument #1 to 'band' (number expected, got nil) [C]: in function band'
Interface\AddOns\WeakAuras\Prototypes.lua:727: in function CheckCombatLogFlags' Interface\AddOns\WeakAuras\Prototypes.lua:1899: in function ?'
[string "--[==[ Error in 'Shield Bash Miss 2':'condi..."]:18: in function ?' Interface\AddOns\WeakAuras\WeakAuras.lua:5695: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:5660> Interface\AddOns\WeakAuras\WeakAuras.lua:5777: in function UpdatedTriggerState'
Interface\AddOns\WeakAuras\WeakAuras.lua:5544: in function UpdateFakeStatesFor' Interface\AddOns\WeakAuras\WeakAuras.lua:5517: in function FakeStatesFor'
...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1788: in function PriorityShow' ...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1660: in function PriorityShow'
...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:1615: in function <...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:1580>

Time: Sun Oct 6 13:15:33 2019
Count: 1
Stack: Interface\AddOns\WeakAuras\Prototypes.lua:727: bad argument #1 to 'band' (number expected, got nil)
[C]: in function band' Interface\AddOns\WeakAuras\Prototypes.lua:727: in function CheckCombatLogFlags'
Interface\AddOns\WeakAuras\Prototypes.lua:1899: in function ?' [string "--[==[ Error in 'Shield Bash Miss 2':'condi..."]:18: in function ?'
Interface\AddOns\WeakAuras\WeakAuras.lua:5695: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:5660>
Interface\AddOns\WeakAuras\WeakAuras.lua:5777: in function UpdatedTriggerState' Interface\AddOns\WeakAuras\WeakAuras.lua:5544: in function UpdateFakeStatesFor'
Interface\AddOns\WeakAuras\WeakAuras.lua:5517: in function FakeStatesFor' ...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1788: in function PriorityShow'
...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1660: in function `PriorityShow'
...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:1615: in function <...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:1580>

Interface\AddOns\WeakAuras\WeakAuras.lua:5394: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:5375>

Locals: `

error example 2
Message: Interface\AddOns\WeakAuras\Prototypes.lua:727: bad argument #1 to 'band' (number expected, got nil) Time: Sun Oct 6 13:46:20 2019 Count: 6 Stack: Interface\AddOns\WeakAuras\Prototypes.lua:727: bad argument #1 to 'band' (number expected, got nil) [C]: ? [C]: in function band'
Interface\AddOns\WeakAuras\Prototypes.lua:727: in function CheckCombatLogFlags' Interface\AddOns\WeakAuras\Prototypes.lua:1899: in function ?'
[string "--[==[ Error in 'Shield Bash Miss 2':'condi..."]:18: in function ?' Interface\AddOns\WeakAuras\WeakAuras.lua:5695: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:5660> Interface\AddOns\WeakAuras\WeakAuras.lua:5777: in function UpdatedTriggerState'
Interface\AddOns\WeakAuras\WeakAuras.lua:5544: in function UpdateFakeStatesFor' Interface\AddOns\WeakAuras\WeakAuras.lua:5517: in function FakeStatesFor'
...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1788: in function PriorityShow' ...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1660: in function PriorityShow'
...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:1437: in function ShowOptions' ...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:1375: in function ToggleOptions'
Interface\AddOns\WeakAuras\WeakAuras.lua:75: in function OpenOptions' Interface\AddOns\WeakAuras\WeakAuras.lua:1461: in function OnClick'
...ountant_Classic\Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua:144: in function <...ountant_Classic\Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua:142>

Locals: `

error example 2
Message: Interface\AddOns\WeakAuras\Prototypes.lua:727: bad argument #1 to 'band' (number expected, got nil) Time: Sun Oct 6 13:42:59 2019 Count: 16 Stack: Interface\AddOns\WeakAuras\Prototypes.lua:727: bad argument #1 to 'band' (number expected, got nil) [C]: ? [C]: in function band'
Interface\AddOns\WeakAuras\Prototypes.lua:727: in function CheckCombatLogFlags' Interface\AddOns\WeakAuras\Prototypes.lua:1899: in function ?'
[string "--[==[ Error in 'Taunt+MB+CS+Fail':'conditi..."]:18: in function ?' Interface\AddOns\WeakAuras\WeakAuras.lua:5695: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:5660> Interface\AddOns\WeakAuras\WeakAuras.lua:5777: in function UpdatedTriggerState'
Interface\AddOns\WeakAuras\WeakAuras.lua:5544: in function UpdateFakeStatesFor' Interface\AddOns\WeakAuras\WeakAuras.lua:5517: in function FakeStatesFor'
...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1788: in function PriorityShow' ...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:1651: in function Pick'
...dOns\WeakAurasOptions\OptionsFrames\OptionsFrame.lua:843: in function finishPicking' ...dOns\WeakAurasOptions\OptionsFrames\OptionsFrame.lua:900: in function PickDisplay'
...terface\AddOns\WeakAurasOptions\WeakAurasOptions.lua:4484: in function `PickDisplay'
...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:545: in function <...eGUI-Widgets\AceGUIWidget-WeakAurasDisplayButton.lua:505>

Locals: `

To Reproduce
Not sure how to reproduce - just sometimes the WA isn't editable. At least one of mine has permanently becomes uneditable.

Screenshots

Did you try having WeakAuras as the only enabled addon and everything else (especially something like ElvUI) disabled?
Yes, tried disabling everything else same issue.

Which version of WeakAuras are you using?
2.15.2 Classic

Additional context

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