DigitalVolcano Software Support

Duplicate Cleaner Pro 3.2.7
Windows 7 x64 SP1
Target drive: NTFS v3.1 (from fsutil fsinfo ntfsinfo)
Old scan options and paths on start

Upon starting Duplicate Cleaner, old values may be loaded into the Search Criteria and Scan Locations tabs. These old values may not match the last scan, leading to content in the Duplicate Files tab (which does represent the most recent scan). This means that a user may be given the wrong impression of what parameters led to results (leading to improper user actions) and that Scan Now will not repeat the last scan (and update the displayed results in Duplicate Files) but will instead repeat an old scan.
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?The conditions leading to this behavior are unclear, but occurred repeatedly during testing for the "Create Heardlinks fails on read-only files" issue. Old search options are commonly present after restarting Duplicate Cleaner following behavior 1 in that ticket (#911209; file to "remove" and reference file for hardlink are both read-only). The broken state of the "Delete, Rename or Hardlink Files" window and dctmp__* files being left behind may not be the only results. Duplicate Cleaner may fail to save the last used search options in that condition.

> The conditions leading to this behavior are unclear

Well, the Results List contain the data from your last scan.

But that does not stop you from changing Search Criteria & not running a scan.
And then when you close & restart Duplicate Cleaner, both the (revised) Search Criteria & the (prior) Search Results are retained.
And yes, one need not necessarily have a relationship to the other.

You can disable the option to show the results from the last scan.

This is possibly because the program isn't shutting down correctly due to the errors you have been getting. Settings, scan paths, etc and saved upon exit in version 3. The next version (4) will save settings upon starting a new scan - so if there are any issues it makes it easier to trace what the starting point was.