I have DBM version 1.13x installed as I play classic. After today's update to the WoW client, Twitch is now displaying an "Update" button for my installation of DBM. When I click the update button, Twitch installs the retails (*.x) version of DMB and removes my Classic (1.13x) version.

I can manually install the retail version, but I do not eve recall doing this before. I have used Twitch's "update" button just fine.

I suspect that some versioning flags in Twitch, DBM, or WoW.exe or all three have produced this issue.