I just installed Roundcube. Tried both the released beta and latest from svn. I get this error randomly, but consistently when I compose a new message and hit send. I also get it when trying to modify the personal preferences of someone, or add something to my addressbook.
Basically, I can't do much except check mail without getting the error. I have tried both Firefox and IE and multiple PCs.
Any thoughts? Isn't it a cookie issue? I turned on debug mode... no additional errors reported on the screen.
Thanks,
Joe