I have used stacks in Lightroom for a long time but I am now having a problem. My typical workflow is to process RAW images in the Develop Module then Export them as JPG files. I choose "export to same folder as original" and I check "add to this catalogue" and "add to stack above original". Until recently this has worked well - the RAW and JPG files appeared as a stack in the catalogue. Now, when I go back to Library I do not see the JPG files in the catalogue and there are no stacks being created. (I can see that the JPG files are appearing in the same folder as the original RAW files as I intend them to do.)
An additional observation is that stacks that were previouly created are not behaving normally. When I split a stack, the stack status is compleley lost - the number in the upper left corners are gone.
How can I fix these problems?