I've been experimenting with HDR/EXR-format render exporting, and I've noticed that, for sufficiently old renders in the cache, HDR and EXR stop being export options. I've just noticed that spot renders seem to have the same problem. I rendered a full image, which I could export as an EXR without a problem. I then did a couple of small spot renders on top of it to correct a minor mistake I made, but when I try to export the resulting image, EXR isn't on the drop-down list of available formats, and neither is HDR. What the heck is going on? Thanks in advance for any advice!