Guilin Sun
Ansys Employee

 

From your description, it seems it does not mean the installation has anything wrong. To test if it is due to  new version or installation, please test your original file withut changing the material. If you change a PEC to metal with heavy loss, the memory can be significantly more. 

You can also test a simple example such as this one: Creating line plots of far field projections and check the memory.

Please write post in the Photonics Forum which is faster to get answered:  https://forum.ansys.com/forums/forum/discuss-simulation/photonics/