When i get invited into a party I always have to go into the fs settings and uncheck and check the hidden option to remove me from the party frames.

Thanks for the report, I'll look into it and publish a fix asap.

I also could have mentioned i use the default blizzard party frames and only use it for 5 man party, so thats where i have the issue.

Just published a fix in release 6.6.2, let me know how it goes!

Nice! Will test when i get home from work, still morning here

It works (like 99%)! There seems to be some situation where i saw my frame blinked in and out. Not sure what produced it

Glad to hear it's better now.

Were you by chance in Edit Mode when it blinked in and out?

Will close this issue, can create a new one for the flickering if it's bothersome.