I haven't been using the phone for a while, and now I can't see the old photos in the DCIM directory, only the ones that I have taken freshly, and the (old) videos.

Yes, I've checked, the files are there.

Is there any way to make the Gallery app to re-reead the DCIM dir so I can see all the pics?

It also might (but not necessarily) have something to do with the Drop Cache app that I've found on the Warehouse that I've found earlier there, probably run and forgot about it