I'm running a Mac Pro with El Capitan and Reaper 64 bit.  I have the latest Bias FX upgrade.

Whenever I make a custom rig, use different amps/effects than the stock rig, and save my file and exit the program everything goes back to the stock/original rig. For some reason, every time I reopen a project in Reaper is does this.  Does anyone else have experience with this and know how to fix it?

Thank you
'91 Eric Clapton strat w/ MT-2 preamp and piezo bridge system

Lotus '62 Strat replica
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Epiphone Sheraton STOCK
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Traynor YCV40T
Traynor HEAD
This used to be a problem with Ezdrummer & Superior if you didn't have the newest version of the plugin installed.

Also I've read some plugins have trouble bridging between 32bit and 64bit. Are you using all 64bit plugins?