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Si As noted a user reported that on his Windows 98 machine VTT 4.21 was crashing after two hours of use. Beat Stamm managed to do some tests on a Windows 98 machine here in the office, and although he discovered a minor memory issue (which will be fixed in the next update) there was no 'memory leak' present that would account for the tool crashing after a few hours intensive work.
We are happy with the tools performance and stability on all supported Windows platforms. However, it is worth noting that Beat develops and uses the tool on Windows 2000 and most professional users run the tool on Windows 2000 or Windows NT 4.
Cheers, Si