Yet another problem I'm having with the occurence properties in ST9. I have a top-level assembly with multiple parts, as well as a couple of sub assemblies. For one of the sub assemblies, the occurence properties is stuck on not displaying in draft view, doesn't show up in reports, and also is not included in physical properties. When I go in to change these columns to yes, I click apply, but then it goes right back to being no. I'm not sure why I can't get these to change and stay that way. Here's a video illustrating this problem. I apologize for the overwordyness of this.
I have had an issue that is very similar in nature whereas the occurrance properties for one part was set to 0. I would change the 'User-Defined Quantity' from 'Yes' to 'No', thus changing the occurrance from zero to one. I would apply changes, and just like your video re-opening the occurrance properties window all values would be reverted back.
The only way that i have been able to correct this is by deleting the part from the assembly all together, and then bringing it back in. All i can figure is that by deleting the part/sub-assembly from the assembly, would delete all 'links' (for lack of a better word) and any meta-data in the background.