When I inspect the log, it says:

[runtime -> update -> manager] Warning: fetchurl got stuck, respawning
[runtime -> update -> manager] Error: invalid download URL for depot user:<empty/>

Thoughts?

Did you do this step in build.conf:

RUN_OPT += --depot-user <YOU>

It seems like maybe the issue is the related to default depot user being empty? I’m just guessing here, because I’ve never encountered that problem.