OK, so you chose the 'All items from inv. list' from the 'Select' drop-down? Not 'Items from loc. only' or 'Items active at location'? This will print/select all items, whether or not they are allowed at the location. This could potentially be different on the report than what you are able to enter - the difference being the items not allowed at that location.

If you Edit a Location, highlight the Items tab to display which items are allowed at the location - you will see a value of Yes in the Selected column. Do you see a corrolation between dis-allowed items and what you are able to enter (or not) for physical inventory? If so, perhaps you need to select the 'Items from loc. only' option when printing your pysical inventory report and generating the workfile?

Those numerical values in the file name have an internal correlation to your location codes, but this is stored within the data file and is nothing you can see. If you want to see the correlation, preview the Physical Inventory worksheet for a single location (not all of them) and note which data files get updated to the current date and time.

Don't worry about that file named ICWCTL - it is a control file that keeps track of all locations.
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From your original post, you said that for some locations when attempting to Edit the quantities, nothing appears. Does that mean that you have no items, or that some items are there an not others? If you preview the worksheet for just that location, are you able to edit the quantities for that location? And if not, do you see any ICW### data files getting updated with new dates/times?

Ensure that none of your data files are marked 'read-only' and that you have security rights to create and over-write files in your data directory. I presume the security is OK as you have success with some locations, but the 'read-only' could be the cause. Or perhaps this files are locked on the server.

If you want to start from scratch in generating the workfiles (nt in doing the count!), you can try having all users exit Adagio, and remove all of those ICW### and ICWCTL data files to a different folder (I prefer moving files rather than deleting). When you next start Inventory, the ICWCTL files will be re-created. And when you print preview the physical inventory report for all locations, the workfiles ICW### will be re-generated. It should be as simply as that - if you run into any problems then please post the error messages.