I have similar problem: mouse cursor lost on Windows 8.1.
Server: Linux 3.13.0-26-generic #48-Ubuntu SMP i686 GNU/Linux
Client: Windows 8.1, NoMachine 4.2.21 – 4.2.23
Problem was found today, shortly after windows was updated (KB list below).
Things I’ve tried so far:
- disable hardware acceleration;
- change mouse cursor theme;
- change encoding codec;
- change client OS to Windows XP SP3;
- updating NoMachine to 4.2.23
None of this measures were effective.
Installed updates (in time stright before problem find out):
KB2931358 (IE11 update)
KB2954879 (.NET 4.5 security update)
KB890830 (definition update)
KB2953522 (IE11 update)
KB2957151 (IE11 Flash update)
KB2931366 (.NET 4.5 security update)
KB2542054 (VS Express 2010 update)