>> Yes, it appears that under certain (as of yet unknown)
>> conditions the while loop at line 2264 will never exit.  The loop
>> control looks like this:
>> while ( v <= ceData.maxSteps + 1 ) {

I found the issue.  The slider drawing code did not initialise the min/max
variables, therefore anytime a slider was shown there was a risk of a
random application hang.

This has been fixed in GIT hashes 6c72a84 and 2c0153b (Qt3 and TQt3,
respectively).

Thank you for your help with this issue; the backtraces were invaluable in
tracing the problem!

Tim