Error when searchin with developer instance: sysparm_search_sources must contain at least one sys_id

[MicheleD]

I've been using a SNOW dev instance for the last couple of months for demo purposes. Today, I am unable to search for any tickets. Whatever I type into the search bar, I get the following error message: 

Bad Request (400) sysparm_search_sources must contain at least one sys_id

I am not able to find any references to this issue online. Any help or suggestion is welcome.

[Rob Milstein]

You are not alone. Search used to work, but like you I am seeing the same error today in my PDI. It can't be related to any development because I didn't make any yet (only activated some plugins a couple months back).