What steps will reproduce the problem?
1.Start logging a log file that max size limit and rolls over when that limit 
is reached, renaming the original log file.
2. Start process that fill up the log file.
3. The process will stop to respond when the log file reach the preset limit. 

It appears the logviewer locks onto the file so that the OS (Win XP) cannot 
rename the file when the limit is reached.