Shalom UV! Ma nishma?

(Sliha, ani lo medaber ivrit -Sorry I do not speak Hebrew.)
I have just had very similar trouble with my forum. The cause of it is simple - Wordlets!
For example, my trouble (not working graemlins was caused by using double quotation marks (like this ") within a description of URL wordlet.
When page is generated and Javascript takes the wordlet, it puts it in quotation marks. If your wordlet has one or two already, script stops reading after it, as it expects for closing brackets - ( .
Having checked your source code, I found that row 80 (var thisEmail) has prompt of Hebrew words (I cannot say which words as I don't have hebrew support on my computer).
One of the hebrew letters, while reading in plain English represents itself as quotation mark ("). Perhaps, that is yud, but I cannot say. It makes your Javascript stop working.
The possible solution is. Go to yout Post a Reply window, say yes, when explorer asks if you wish to debug, and after page will have been loaded, View->Source. When source will be opened in Notepad, find a row, which call var ThisEmail=prompt... and check, what is written inside brackets. After that go to UBB Control panel, find a relevant wordlet with these words and put there some English (just to check). Save wordlets, clear cache and retry Post a reply. It should work, unless there is no other similar mistake.
Pls let us know about the results.
As the last comment, it is better to keep UBB working on some multi-lingual server (like localized versions of Apache).
Best regards,
Evgen.