Hi Juan,
Oddly enough, I'm no longer getting the error, but now nothing at all happens when I click the circle for Real Time Preview. The preview window does not open, nor do I get any errors. I tested Real Time Preview in HistogramTransformation to see if the issue was persistent, but it works as it should.
After discovering that it wouldn't open at all, I tried reinstalling PixInsight and restoring the settings to default, but it didn't help. I've rebooted the PC multiple times throughout my troubleshooting. I also ran some tools to check my Windows system files, but no problems were found. Do you have any suggestions or are there any logs that I can provide to help you determine the cause of the issue?
Thanks
Jeff