We have scheduled a number of updates to REBOL over the next couple weeks.
If you have a specific problem or fix that you need, be sure that we know about it. Contact me or Gabriele, or also Ladislav or Cyphre.
The first update is just one of building on a different compiler. For most developers, this will be a nop (no-op), and you should test it, but it should in theory be identical.
After that, we will begin making fixes according to the priorities specified in the RAMBO bug database.
So... check that your problem/bug is listed in RAMBO, to be sure we see it.