Onlyoffice opening existing word documents as blank pages

Hi Vlad,

I've been having a problem with Onlyoffice lately that is causing my documents to open as blank pages. I have tried to track the issue down myself looking through the logs, etc. but I cannot find anything that may be causing my issue. The exact issue is that existing word documents are opening as blank pages, when the document should have information in it.

I realize there are a number of things that could be causing this, but I will list a few basics of my setup to hopefully help narrow things down:

1. I'm running onlyoffice on the same server as filerun, but filerun connects to onlyoffice via reverse proxy
   1. The reverse proxy should be configured correctly with client_max_body_size 50M
   2. I can connect to onlyoffice via reverse proxy using HTTPS at the url editor.docs.mysite.com
   3. onlyoffice HTTPS runs on port 444, filerun HTTPS runs on port 443
2. onlyoffice, filerun and dependencies are at the latest versions (onlyoffice-documentserver v5.2.2)
3. filerun is using php7.0 and should have all php.ini settings configured per your guide.
4. User files directory has permissions www-data:www-data

When I double click to open a document:

After the document has been opened:

Another issue that may or may not be related is that I can't get XSendFile acceleration to work. When I have that enabled in file->misc options->enable download accelerator, downloaded files are 0-byte files.