WowAce

What steps will reproduce the problem?
1. Right-click a vendor, open the filter using the arrow icon at top of window, select "Options" to get the interface window overlay.
2. Check "Leather" (Item Type Filter > Armor > Leather), then click "Okay" to close window.
3. Close vendor window, right-click vendor again, and successfully opens to show only leather items.
3. Close yet again, reopen, and successfully opens to show only leather items as the default.
4. Now select "Options" again to uncheck "Leather", click "Okay"
5. Close vendor window, right-click vendor again, and no items appear at all.
though I expected to see all items offered by the vendor, since no filter was applied, instead no items at all are shown.

What is the expected output? What do you see instead?
I had expected that with no filters applied, I would view the complete list of vendor offerings. But the new default seems to filter everything. I tried this with other filters (ex. Staves), and got the same result. In the end, removing filters via the interface pane resulted in extremely restricted filtering rather than no filtering, which I expected.

What version of the product are you using?
v1.0.8

Do you have an error log of what happened?
No (more specifically, I don't know how to access the error log -- first time submitting a ticket.)

Please provide any additional information below.
Specifically, the vendor is Captain Dirgehammer, in the Champion's Hall at Stormwind. My character is a L85 druid. (In case any of this matters.) I fixed the issue by copying the settings from a clean, untouched profile, and then was able to duplicate the issue.