instant preview ignores some indices

[Jannick Asmus]

Hi,

the instant preview ignores some of the indices. E.g., $\Phi_{K}$ is 
correctly displayed whereas $\Phi_{\mathbb{Q}}$ ignores the index. The 
source is copied from the source code window.

Can this be amended?

I am using LyX 1.6.4. on WinVista.

Best wishes,
J.