Windows 7, Reaper 5.40 r584a8e, HISE VST 0.983, all 64-bit.
Reproduce: Put HISE on a track. Load a preset in to HISE. Save the project and close it. Re-open the project in reaper.
Alternatively, save the preset with Reaper's preset tool. Then switch back to "default," and finally to the newly created preset.
Result: Crash to desktop.
Expectation: Project should load, and also load the preset HISE was given at the time.
Recording of the bug: https://vid.me/1I2g