Win7 64bit / GTX960
Short description of error
"Convert to" operator is not working properly in 2.8 branch. In most cases pressing ALT+C won't do anything, menu entries in Object>Convert to are grayed out. If I duplicate object operator works but only on last duplicate and when modifiers settings were unchanged.
Exact steps for others to reproduce the error
Switch to render engine other than Eevee or Clay.
Add Subdiv modifier on default cube and press ALT+C - Nothing happen.
Duplicate and move object two times.
Press ALT+C - Menu pop up and operator can be invoked.
Select first duplicated object and press ALT+C - Again nothing happen.