Hello again and again...
If you have problem with freezing Uplink (even with ver 1.21) and you have processor with
HyperThreading or Dual Core then this feature could be a problem.
After switching off HyperThreading (I didn't test it with Dual Core well) problem is solved.
You can turn off HyperThreading (and probably Dual Core) in your BIOS.
I have read on this forum that Ben is working on Uplink ver 1.3 with will solve this issue.