Spark failing to load

I’m having an issue whereby sometimes when I load Spark, mainly having just closed it seconds before, it hangs in the background. The interface never loads and it never makes the applications list in Task Manager, but it is listed as a running process and ends up using 40MB of memory without ever displaying. Usually I can kill this process and then reload Spark, but sometimes even that doesn’t work and I need to restart.

I’m using 2.5.5.

Whoops, entirely user error.