OpenLP Never opened following Setup Completion

Installed OpenLP 2.4.6-1 in Linux Mint 19.3. Accepted all defaults in Setup. Got logo, but application never opened. When I enter  <OpenLP> in terminal windwow, I get message that "OpenLP is already running, do you want to continue?" If I type yes, I get the following in terminal:

QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
error: XDG_RUNTIME_DIR not set in the environment.
Segmentation fault

Prior to this, I was getting a "core dumped" following the Segmentation fault. I don't know what has changed, but I now have to type "sudo" to even get "OpenLP" to be recognized in Terminal. I am definitely NOT a Linux guru.

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