Incidentally, as far as I can tell, JIFP is not a "thin client" - it is basically the whole of Flitestar. The main difference is that while FS gets its data from the CD, JIFP gets it over the internet. I have used both (use FS quite often) and didn't detect any real difference - other than JIFT being much slower due to the remote database accesses.
Jepp are very short on software development resources. If you look into their products in detail (say, Flitestar and Jeppview) you find they are very similar in the internals. This stuff has not really changed for about 10 years. I would guess they are tearing their hair out trying to work out why Vista doesn't like some piece of 1995 code in their program, whose original developer left years ago or, in the case of Flitestar, was never around because that product was bought in.