Hello everyone,
we found out that this behavior is caused because in the project, there is one singleton model and over 300 textures for this model. This means that RC is loading all the textures when creating ortho projection at once and therefore consumes too much RAM. We need to fix this and will let you know once the issue is fixed.
In the meantime, you need to either import the model and change in the RECONSTRUCTION - Settings - Model import the ‘Maximal vertices count per part’ to a smaller number so that model will be divided into parts and unwrap and texture the model again. Or if the model was created by simplification, there is a need to change Preserve parts to ‘True’ in the Simplify tool settings and again unwrap and texture.
Thanks again for reporting this problem and we are sorry for the inconvenience caused.