When I got in in the morning the past several days, I have seen this.
I have several logs that rotate overnight and they are set to "Clear all log entries when the log file is rolled or recreated".

Please let me know if I can provide more helpful details.

Thanks for reporting this issue.

This is an issue with a third-party GUI library which may be caused by a lack of system resources.  I can see that the error reporting has been triggered, but it is unable to display.  What does LogViewPlus's memory and CPU footprint look like in the morning relative to the rest of the system?

We will be upgrading the component responsible for this issue in the next release of LogViewPlus.  That might help with the issue, but I suspect the problem is more resource based.