Material Browser going blank

[Sawyer]

Not a big deal but I have a scene where I render it at night come in in the morn and the material browser is blank. Is there a memory issue I am bumping up against or a bug? Infact there are sometimes I would want to know how to do this (without merging into a new scene.


Thanks

[teabag]

looks like your vray is disconnecting from material editor...look in the assign renderer tab maybe first thing you come to the comp?

[Sawyer]

I am often removing the dongle... Maybe thats it?

[PIXELBOX_SRO]

it takes sometime b4 the dongle strats up whne you connecting it...depends when you take it out