I have run into the following problem (ZTW64 2.4.39, Win7, 64-bit):

1) View a (large) file (I am looking at a .!bt file). In particular a file that is all zeroes.

2) Enter a HEX search string of a long sequence of 00 00 00 00 ...

3) Doesn't seem to matter if it is hex or dump mode, but certainly happens in Dump...

4) Hit Junk

Ztree goes off to never-never land, apparently an infinite loop. The CPU usage jumps from maybe 3-5% into the 20's. Have to kill ZTree from TaskMgr...

-- Walter

Side note: It would be nice if one did not have to put a blank between each byte of a hex search string...