I had some trouble with my Unraid/Pydio install and the "Pydio blank screen of nothingness". So wanted to post how I fixed it and maybe someone else can use the information.
The short back story...
My Nginx reverse proxy to Pydio installation was not always "stable". Different browsers gave me different problems, googled some fixes and it was suggested to log into Pydio and change the Server URL under the "Pydio Main Options' to fix it. It did not. Now every time I tried to connect got a blank screen. No Pydio log errors, no Nginx log errors, just nothing. I tried uninstalling and reinstalling the docker 4 times (with Unraid restarts), no bueno.
Hindsite - Don't change the Server URL!
The Fix...
I'm using the MySQL and Pydio dockers (thanks to those that created them!)
First:
Log into the MySQL docker: docker exec -it dockername /bin/bash
Log into the dbase: mysql -u username -p
"activate" the database for pydio: MySQL> use pydiodatabasename
Delete the core.ajaxplorer line inside table ajxp_plugin_configs: MySQL> “delete from ajxp_plugin_configs where id = ‘core.ajaxplorer’;”
Next:
Log into the Pydio docker: docker exec -it dockername /bin/bash
cd over to the "/data/cache/" folder and delete any ".ser" files
Restart the Pydio docker
It should be fixed now.
Bonus Content...
Aptalca has a great nginx-letsencrypt docker that creates free certs for SSL sites (like my Nginx/Pydio site). This may be in the support thread and I missed it, but pro tip: under the docker SUBDOMAINS container var, there should not be any spaces between the comas and subdomains. it should be like this: subdomain1,subdomain2,subdomain3. If you DO put spaces in there, it will create a cert for the first one, but not the subsequent ones in the list.