T3 jump/slide glitch

[jamillos]

Ho folks,

I've played T3 and everything's fine but for one thing: sometimes when I jump, Garrett kinda slides and can't jump ever egain. The only solution is quick save + quick load, but it's still annoying and very unpredictable – sometimes it takes a while and sometimes it happens twice in a couple of minutes.
Funny thing I used to play it years ago on an old Acer, and I don't remember having any kind of troubles like this.
Other than that, it's just brilliant; if only there wasn't for this stupid glitch. I have only found one thread talking about this but it wasn't solved there or it was just one of the problems and they didn't get to talk about it much...
I have win XPs SP3, Asus, Intel core duo, nVidia geforce.
Thief 1.1
Thanks a lot in advance.