Excuse us for the caused inconvenience!
Unfortunately, the fix for this issue would be time and resource consuming and currently our team's priority is focused on building new version of JustCode on the top of Roslyn, so it is really impossible for us to deal with it right now.
As a workaround I would recommend you to ignore these false errors. Here is how to do it:
1. Place the caret on such an error
2. Open Visual Aid | Fix | Configure "Language error" | Find all such problems then JustCode Errors window will open
3. Mark all errors with description "VB.NET: Unknown type or namespace 'Forms' of 'Windows'"
4. Execute "Ignore Selected Errors/Warnings" command in the context menu of the errors grid.
I hope this will help you as a temporary workaround. Also, have in mind that since we are using Roslyn in Visual Studio 14.0, there will be no false errors/warnings for C# and VB.
If you have any further assistance, please do not hesitate to contact us!
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