I play with the MetaMorph mod which gives me ability to change my character to other mobs, when passing a portal somehow my function to change my form disables when passing a portal, once i got stuck in enderman form.

Game log:
launcher_log.txt

Possible workaround:

• Press N
• Notice lack of morphs
• Use the Show Favorites button twice
• Notice morphs having re-appeared ([ and ] also start working again)

Also causes glitches with changeling morph mod. Morph mod. and metamorph mod!
Metamorph and changeling mod have practically identical issues.
Some kind of incompatibility issues. could be on either mods end.
changeling mod seems to have the best features out of the three morph mod variations. but still has some issues with better portals mod for some reason.

Morph mod also causes graphical artifacts/glitches in some situations especially badly with better portals mod. with more than one player its even more noticable.

This should be fixed as of Metamorph 1.1.9.

@realflow100
Changeling is based on metamorph, so they can probably incorporate my fix for it without too much hassle.
iChun's morph mod is completely separate (afaik) and the issue with it is a known one: #345. I have not yet looked into it but chances are it needs fixing in Morph, not in BP.