08-19-2018, 08:16 PM
Web browser control does not like multiple threads. Some pages OK, some add several MB after closing each time, YouTube refuses to load 3-rd time. I also tested in .NET app, the same. For YouTube I have a workaround, but it does not work for other pages. Look for workarounds in stackoverflow etc. As an often suggested workaround, I can only suggest to run the dialog in separate process.