As mentioned in the curse and wowace comments, I am having same problem

the "cast progress" is not shown, only the time

3.7.5 Upon login my castbar background seems to have a higher strata than the actual castbar and the bar just stays as the background alpha with text.

This issue also happens for me, it happens every time I log in or reload on any character with this profile.
The problem seems to go away when I change any setting.

Here's a video of it happening: https://streamable.com/lnhcfh

I've attached my config as a txt file, the profile in question is ZeffUI

Quartz.txt

#66 seems to be describing the same issue.

I use the following work around. Use the following comand in a macro and run it after logon:

/run LibStub("AceAddon-3.0"):GetAddon("Quartz3"):ApplySettings()

I originally had a macro that swapped the profile and toggled the Target castbar but realised the above worked without the other commands. Original Macro:

/run LibStub("AceAddon-3.0"):GetAddon("Quartz3").db:SetProfile("Fullscreen HD (ElvUI)")
/run LibStub("AceAddon-3.0"):GetAddon("Quartz3"):SetModuleEnabled("Target",false)
/run LibStub("AceAddon-3.0"):GetAddon("Quartz3"):SetModuleEnabled("Target",true)
/run LibStub("AceAddon-3.0"):GetAddon("Quartz3"):ApplySettings()

EDIT: the above command(s) only appears to work once Quartz has been called ie after the cast bar has been displayed once