I'm sure mine are alphabetical as my Bass rigs folder is near the top and Vox is right at the bottom.
If you quit rig manager and reopen it it will be sorted alphabetically
Still, the possibilitiy to reorder them the way I want would be most welcome.
order by name in ascending order is the common ground - a workaround I used to use is adding a numerical prefix "111_", "112_", "121_", ... to the folder name. Looks weird at first, but it presents the possibility to create a "virtual" hierarchical structure.
Not nice visually, but very practical as you can easily "move" folders around by changing their prefix number.
Ahhh, this may be why I didn't catch this. I put my computers in sleep mode and rarely reboot them, so didn't notice rebooting does alphabetical.
.
You don't have to reboot.
Just close RM, and reopen it.
You don't check for new rigs between updates?
Once a month is pretty much as often as I listen to new rigs, too. I close and launch RM more often than that though, because my toaster goes to gigs with me 
