All text should be readable.
White text on almost-white background appears.
Client version: 2.5.2git
Operating system: Ubuntu 18.04
OS language: US English
Qt version used by client package (Linux only, see also Settings dialog): not available
Client package (From Nextcloud or distro) (Linux only):
ii nextcloud-client 2.5.2-20190319.015224~bionic1 amd64 Nextcloud desktop sync client from ppa.launchpad.net/nextcloud-devs/client/ubuntu
Installation path of client: /usr/bin/nextcloud

This bug is also happens on on windows os.
When the application first is launched the text is black, but it seems to switch to white whenever there is a notification banner underneath it.
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I believe we have fixed this. Could you try 2.5.3 or the release candidate for 2.6?
https://github.com/nextcloud/desktop/releases
I don't seem to be able to trigger an sync error when I need it :smile: — but will keep an eye out for the rendering bug in the new sync client!
I just installed and tested this with 2.5.3 and then 2.6. The issue still exists. I only tested this on my Win 10 Laptop.
I have the same issue with the white font.
Ubuntu 18.04, using the PPA to install nextcloud.
Nextcloud 2.5.x (don't know which version) and 2.6.0
Just upgraded my desktop client to Version 2.6.1stable-Win64 (build 20191105)
The issue still exists.
I can confirm that this issue also exists on Windows 10 (Version 1903 Build 18362.535) with Nextcloud 2.6.1stable-Win64 (build 20191105)
Most helpful comment
This bug is also happens on on windows os.
When the application first is launched the text is black, but it seems to switch to white whenever there is a notification banner underneath it.