When using a weapons workbench my energy weapons do not show as being available to upgrade. I have laser weapons in my inventory, they just don't show up in the weapons workbench. If I revert to an earlier save then they do show and I can mod them. This is the second time this has happened and I don't want to have to keep reverting to earlier saves.

If it worked before, are you using the beta patch for Fallout 4?

I can get it to work now if a load in an earlier save. So I don't think it matters what version I am on (I don't think I am using the beta patch, using steam). The first time this issue happened was Sunday. When I tried again on Monday it started working. Tuesday, issue started again. If I now revert back to a Monday save, it's working again.