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Hi all, long time no post.

DP 9.5 was working fine in 64 and 32 bit modes; I was able to use 32 bit mode to open older DP projects that used MSI and Mach5-2 and they showed up with no problem. My older tracks with IK's Guitar Rig 3 even showed up. But I just upgraded to El Capitan (because EZ Drummer was flickering in Yosemite) and now MSI and Mach5-2 are listed as "missing."

Is this a Java thing or something else that El Capitan has removed from the equation? I tried going back to DP 9.13 but the plug-ins are still "missing."

If it's a "java thing" then installing this will fix.
https://support.apple.com/kb/dl1572?locale=en_US

32 bit apps still work if the GUI was updated to Cocoa. Carbon only GUIs haven't worked since Yosemite (or was it Mavericks?) It may be a Carbon vs Cocoa. if so, 32Lives may help ($99).
https://www.soundradix.com/products/32-lives/

If it's SIP, you can test by disabling — If MV2 works, that was it.
https://www.macworld.com/article/298611 ... pitan.html

It could be none of the above. Upgrading to MachFive3 should do it in any case. It's 64 bit. $179 and includes a large number of older UVI VIs and effects (the included UVI DVDs might not work but the downloads do).
https://motu.com/store_products/software/machfive

MachFive3 works pretty well. It will no longer host the latest Kontakt nor UVI Libraries but that shouldn't be an issue for you.

Thanks, Mike. I do have MachFive3 already; I use it with the 64bit MSI library in newer projects. But I have over a dozen older songs that used the native MSI & MachFive2 plug-ins that opened and played with those old versions as late as last week.

I will investigate your other suggestions, I appreciate them!