This has happened twice now, when right clicking in umbraco admin tree instead of getting the umbraco menu options we see the standard html right click menu.
doing a "IISRESET" fixes it but this is once a week now.

this is what I'm seeing in the eventlog:

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 25/09/2007 3:04:22 PM
Event time (UTC): 25/09/2007 10:04:22 PM
Event ID: 0a2296af83894917b10db8a998101f56
Event sequence: 1714
Event occurrence: 6
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/1506081920/Root-1-128351513712187500
Trust level: Full
Application Virtual Path: /
Application Path: E:\UMBRACO3\
Machine name: WEB1

Process information:
Process ID: 4952
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: TypeInitializationException
Exception message: The type initializer for 'umbraco.BusinessLogic.Actions.Action' threw an exception.

Request information:
Request URL: http://www.courtenay.ca/umbraco/js/contextmenu.aspx?test=23

I am experiencing this today. Site was upgraded to 3.0.2 a week or so ago and context menues have worked ok so far.
Have another site in v.3 beta 1 state on the same server. This works ok.

Had another kind of trouble with the mentioned site on friday, got null object messages on every node except root. But after traversing the content nodes a number of times one of them suddenly came up normally and after that they appeared one after one. I'm no technical wizard and told the customer that this was due to some belated initiation of program objects :whistle:

I have had the same problem with version 3.0.3 of umbraco.

Right clicking on the tree nodes in the admin area (action which initiates the context menu) causes a javascript error.

Doing an IISRESET did fix the issue but I am guessing that it will be back. Has anyone got a solution for this problem?