I just upgraded to Cubase 15 and this issue is bad. Basically after my Cubase Project has loaded and the MIDI Remotes have initiated, all incoming MIDI in MGP is broken. If I do the unplug /re-plug USB, quit Metaserver/launch Metaserver routine a few times I can get everything working eventually.
MetaServer Win 6.0 is coming soon (Beta 1 will come this week) - it will solve tons of issues related with MIDI (we have migrated to the new MIDI Services etc.) Working our asses off at this moment with the redesign - our number one priority.
Also we have just released MetaGrid Pro 1.6.20 Beta 4 with the totally rewritten connectivity handling - patching the old system designed a couple years ago was a dead end.
I am confident that these changes should solve your issues once for all.
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