You didn't happen to accidentally install the 32-bit version of Reaper when you meant to install the 64-bit version, did you?
If you do that, only the 32-bit VSTs will show up, so could result in the behaviour you are seeing (depending on whether you have a mix of 32-bit and 64-bit VSTs).
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Best Regards, Ernie "lunker" Lundqvist
BDSM (Bad Dog Studio Musicians)
Windows 10 running on Z390 + i7-8700
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