Filter > Distort no longer working
I have a doc in which I've been using the wave smart filter to create a jagged edge.
I opened the file again today to continue working on it and the wave filter is greyed out with a warning symbol next to it. (Nothing happens if I click the symbol though) If I turn the filter off then on again, it stays off.

If I go into Filter > Distort, the distort option is greyed out.

What's going on? Nothing has changed in the file. Could it be that my file is too large to handle any more wave distortion? It is 900MB and a psb file, as I need each image to be super high res for my client.
the layers are shape layers converted to smart objects, and the doc is RGB/8bit. Let me know if any further information is needed.
