Hi,
We met the exactely same symptom of freezing:
2 W2Kserver SP3 with load balancing, metaframe XP SP2, PC with client ICA, windows desktop published with Word/Excel/Pwp + Lotus Notes 6 + Client Access V5R1.
Servers: bi-processors 2,2Ghz Xeon, RAM = 4Go, 70 users connected sinultaneously.
We found that printing on local or shared printers causes serious problems of slowness, but network printers don't. It's certainly a first way to explore.
I'me waiting for others ideas.
Thanks a lot.