You're right, apparently nothing was changed on the forum, because when I tried to access it from the office this early evening, I did again get these alerts (WinXP, IE8, all latest updates installed) and was even redirected to another site and had difficulties to leave it (all sorts of Javascript-driven dialogues appeared).
So I expected the same problem again later this evening when I woke up my laptop from hibernation (Win7Pro/64, IE8, all latest updates installed) and tried to access the forum, but much to my surprise: No alert, redirection or annoying behaviour at all.
Strange, uh...?
Ok, forget about the post above. I just did a Google search for "roundcube forum" on the above mentioned laptop. One of the links presented to me, was
this one. (do NOT click this, unless you are curious and can handle it!)
Clicked on it, and was redirected to: tinyurl4.info/3a930cee
I had to remove the "http://" to display the real link in this message, as otherwise the forum software apparently does a lookup and does reformat the link this way:
TINYURL4.INFO - free url redirection and masking service (do NOT click this, unless you are curious and can handle it!)
Even more strange: I did not get any alert from MSE.
Honestly: Move this forum to a different site, please.
We are running a dedicated server, if we can be of help, please let me know. (No promises, though, I would have to talk to my admin if we could handle this.)
Regards, Michael