Font cache is full


Dear D3D9Client developers,

I am having some issues with Orbiter when trying to run some scenarios which contain the ISS and a self-programmed Soyuz spacecraft.
Sometimes, at some point of the simulation, Orbiter crashes unexpectedly. After checking the log file "Orbiter.log", I can see that after loading all the modules and starting the simulation, a repeated error log is given: "Font cache is full", which is actually, as I have checked on the Internet, part of the D3D9Client Module.
I am using the latest release of the D3D9 client: R15. Could you help me debug this error?

Thank you!