It has never happened to me before; maybe it was a fluke. But suddenly several work-months spread over many years was just gone. Being on the road didn't make it more fun
Anyway, if it is a real problem, I thought you should know about it.
I installed 2.46b and all my custom actions still exist. So OK on my end. p.s. you do realize you can save the files these actions are in to another location as a backup, etc. (or to send to other users so they can install your custom actions)