Well, I finally got around to noticing this thread - sorry for the delay.
I have seen a few quirky things happen with Countdown Timers that work in some instances for some people and then they don't work in others.
I have found that certain browsers (Netscape in particular) and certain operating systems have problems with the escape-code sequence for an apostrophe (\'). The problems I've seen surround the fact that either the browser or the operating system isn't copying the backslash (\) over to the signature area. When this happens, the javascript thinks that the un-escaped single apostrophe (') is an end-of-text marker and thinks that everything after it is code. Then it tries to interpret it.
For example, if the text above your Countdown Timer was:
Well, that's all I have to say on the matter!
The javascript interpreter would grab the apostrophe in the line (the one in the word that's) and think it was at the end of the text. It would then try to interpret everything after the apostrophe (s all I have to say on the matter!) as code, throwing back an 'Undetermined String Constant' error.
Anyway, sorry if the answer there is a bit too technical - to summarize, it's a problem with either your browser's or your operating system's cut & paste feature, and I can't do much to help you there.
If you have Internet Explorer, try putting the Countdown Timer in through IE and then revert to your original browser.
Hope this helps!
- Jim