This looks like something that should be posted to "report an issue" for the TS Techs to look at. Is "count" visible on any of the windows currently open? Are there any calculation fields present on this window or another that refer to "count" in their calculation expressios?
Thanks, I will post it to the "Report an issue" section.
In answer to your questions, No - Count is not visible on any of the windowws open, nor are there any other fields based on Count.
My mistake. With it now being possible to place fields and other objects on the gray area to the right of the layout (outside the page/screen area), I had placed a couple of fields (including a summary field) to allow for easy inclusion in data exports, saving users having to dig into the underlying table to find the summary field.
As the fields didn't need to display, I wrongly assumed they would calculate unless required to be used (for example, exported). But it seems, navigation to the layout (at least via the Windows menu) causes the summary field to calculate.