QuickSearch - Launch Games and Run Commands by Search

[Mellified]

extensions.log shows lots of lines like this when I try to search:

09-05 08:47:44.244|INFO |QuickSearch#SearchPlugin:Starting search with 0 candidates.
09-05 08:47:44.244|INFO |QuickSearch#SearchPlugin:Search results:

09-05 08:47:45.945|INFO |QuickSearch#SearchPlugin:Starting search with 0 candidates.
09-05 08:47:45.945|INFO |QuickSearch#SearchPlugin:Search results:

I doubt that tells you much!

It actually tells me more than you might think. The problem likely happens when creating the searchable items, maybe some unexpected characters in some games name causes problems. Also, there is no error message regarding the scoring, so the problem must lie before that happens.
I will add more error checks at the places I suspect could cause problems. In the meantime, maybe just check whether the search threshold is set too low. Maybe it got corrupted at some point.

I changed the value for the search threshold - was 0.6, 0.7 now. No change.

Try this https://www.dropbox.com/s/ndrz927c13levn....pext?dl=0
It should also start logging when opening the search window before typing, so look out for those messages.

I downloaded the second debug version. Looked at the logs. I wasn't seeing additional log messages. I deleted the log. I re-downloaded and re-installed the debug version. Still seeing just these messages:

09-05 11:16:02.111|INFO |QuickSearch#SearchPlugin:Starting search with 0 candidates.
09-05 11:16:02.111|INFO |QuickSearch#SearchPlugin:Search results:

EDIT: I went into QuickSearch settings and enabled ITAD support, which seemed to trigger this in the logs:

09-05 11:17:55.039|INFO |QuickSearch#SearchPlugin:Updated index with 57383 items from 7 sources.
[..]
09-05 11:21:28.427|DEBUG|QuickSearch#SearchPlugin:Failed request to ITAD
System.Net.Http.HttpRequestException: Response status code does not indicate success: 500 (Internal Server Error).