Just an update - I fixed the issue with RWC not showing up in the SMP menu. I deleted the Gizmo64 plugin folder, then reinstalled SMP and RWC using the Gizmo64 Stable option versus Beta (which I had done before). This seemed to reinitiate the X-Aviation licensing and now it is showing up. Once I re-entered my licensing information and restarted X-Plane, clouds are showing up and everything is working.
I also noted that Skymaxx was loading metar.rwx followed by fsgrwsmp.rwx. The fsgrwsmp.rwx was located in my X-Plane folder as I had previously tried FS Global Real Weather and opted to return to using Active Sky XP. However, with that remnant fsgrwsmp.rwx file and the fact that RWC is set up to allow FSGRW / ASXP together, the fsgrwsmp.rwx file kept hijacking my weather, which was why no clouds were showing up (based on the fsgrwsmp.rwx contents) when the X-Plane weather was showing stormy. A suggestion for RWC - perhaps split out the selections as separate for FSGRW and ASXP, with the FSGRW pointing to the fsgrwsmp.rwx file and the ASXP option pointing to the metar.rwx file. That would prevent this from happening.
Regards,
Derek