Several issues since 2019.3 version of IntelliJ IDEA

Hi, I have multiple issues since installation of 2019.3 and even 2019.3.1 patch didn't fix them.

First, in the log, I can see repeatedly such messages:

2019-12-19 12:14:42,646 [ 18722] ERROR - llij.ide.plugins.PluginManager - Must not intern long path: 'licenses\SLF4J.txt'
java.lang.IllegalArgumentException: Must not intern long path: 'licenses\SLF4J.txt'
at com.intellij.openapi.vfs.newvfs.impl.FileNameCache.assertShortFileName(FileNameCache.java:61)
at com.intellij.openapi.vfs.newvfs.impl.FileNameCache.storeName(FileNameCache.java:47)

I simply loaded my existing and idea-imported project with the new version of Idea, but the previously configured debug configuration didn't work.
Tried to add a new Run/Debug configuration but the top left plus button (+) doesn't work anymore. Interestingly only when I am in my own already existing project. If I create a new project, plus button does work. A workaround works, when I choose a template and use the blue create configuration link in the right top corner of the pop window of Run/Debug configurations.

Furthermore, I cannot import multiple maven directories at once at creation of a new project using import maven feature. It simply closes the maven import window without any further message or reason. Before 2019.3 I was able to clone more GIT repos into same directory (for example XYProject directory), and then I was able to start the import process on XYProject directory, as it scanned the subdirectories and found the maven projects.  This was a good approach because in this way I was able to put the .idea directory into this common XYProject directory. Now I have to import one of the maven projects instead, the .idea directory goes into that maven project directory, then have to add the other modules manually later. This is ugly because I sometimes remove the cloned maven directories, and if that is the one which contains the .idea directory, then I have to start to reimport again.

So 2019.3 seems to be a stepback, need to go back to 2019.2 .