This looks similar to a problem that was recently fixed on our side (invalid layout computation for one of the tool windows). Please try this build: VisualGDB-188.8.131.5248.msi
If it doesn’t help, please try evaluating “$exception” in the outer VS instance and navigate to the InnerException field of it. Then check its call stack and let us know (together with the build number it was obtained from) and we should be able to fix it.
Regarding the major version, yes, we are currently finishing our work on supporting more device families and will start releasing preview builds on the next major version introducing new functionality in the next 1-2 months.