Searching for tools yields no results on every other program start.

Hi,

I use Adobe Reader DC Continues Release Version 2019.008.20074

I observe the following behaviour:

After booting the PC, when I start Adobe Reader DC and click on Tools next to Start in the upper left corner of the window, I type in "Zertifikat", or a substring of that, or any other Toolname that is shown before I begin to type.

I expect to see results of that search, in this specific case I expect the "Zertifikate" tool which allows me to use a dongle to sign a document.

What actually happens is that the page is blank, showing no results:

The tools are all there, mind you, it's just that the search function doesn't work:

When I now close the program and start it anew, I observe the correct behaviour of showing one result:

And this repeats every odd numbered time I restart adobe reader. So, first time I start it: it doesn't work, second: works, third: nope, fourth: yepp, fifth: nope... I tried this ten times.

It's bizarre.