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Created attachment 19426 [details]
I added a new ContentPage to my project with the previewer open. When I opened the xaml file I got an error in the previewer about my base class or something being wrong (I lost the error).
I remembered I should recompile the Android, so I did that with a rebuild. During that the previewer warned me I needed to rebuild.
When the rebuild completed successfully I picked a xaml editor window to re-focus the previewer and ended up getting a modal error "something went wrong" over the preview (nice blur background).
After going to my browser and coming back several minutes later, I switched xaml windows again and the previewer seemed to reset. Both pages now render fine. No VS reboot or reopen of any windows.
Created attachment 19427 [details]
Created attachment 19428 [details]
The only thing i can really glean from this is that your xamarin forms version is too old and is hitting issues that were fixed a while ago.
If you can reproduce issues with 2.3.4 or newer can you attach the logs to this bug? Otherwise we could just close this.
Cannot reproduce on 18.104.22.168