This is not exactly a new issue. If you have three or more classes and you are using all three gear pages due to different armor/weapon needs and class levels, then this problem will tend to show up for you at some time or another. (I have a character that uses chain, cloth, and leather armor and, obviously, different weapons and accessories, as well as levels.) No, there is still no EST as to when RW will get around to fixing it, if they can and if ever. Sorry.
Having said that, I've not had the selected gear for the class combo actually *change* following a crash. I *have* had the other gear tabs/pages change their numbered position after normal logouts, depending on the class combo selected when I've logged out. It's irritating and, if you use the Inventory Viewer addon (which has not been updated by its author to recognize the 3rd gear page), it can cause issues. (NEVER scan the gear in pag/tab 3. EVER. Or, at least, until the author gets around to updating the addon.)
The "workaround" that I use when changing classes and gear is to change gear FIRST, then change classes to match the gear. Do it backwards and, depending on your class levels, you can short yourself active HP and will either need to heal up or swap classes and gear a second and, then, a third time.