DAQmx devices not recognized after reboot

I have a PXI-1042 box communicating with a desktop computer over a MXI-3 bridge. This system has been up and running for several years through four or five revs of code. I am currently running MAX 4.6.0f1, DAQmx 8.9.5, LV 2009 and TS 4.2.
Lately when an engineer logs on, although all six cards are recognized in the NI-DAQmx Devices configuration section, only three are listed as installed. All six cards are listed in the Chassis section. See attached screen shot. If the engineer logs out and reboots enough times, eventually all six cards are available. Any ideas on what may be corrupting the configuration?
The PC is a Dell Precision WorkStation 380 (Pentium 4) running XP SP3 with 4 GB of memory. The installed PXI cards are:
Slot        Card
1            8330 MXI-3
2            2567 Relay Control
3            6551 DIO
4            6551 DIO
5            2503 Mux
6            6220 M series DAQ
7            2591 Coax Mux
Thanks, Bob
Attachments:
MAX NI-DAQmx issue.JPG ‏83 KB

John,
Here are answers to most of your questions:
Can you verify that the missing switch modules are always only the switch modules, or are other modules sometimes missing, too?
           >> It is always the switch modules that are missing.
Is the MXI Bridge always connected to the host controller?
Is the chassis always powered up before the host?
           >> Yes and yes.
When the engineer repeatedly logs out and in, do the cards appear only one at a time, or do multiple formerly missing cards appear at once?
           >> They always come and go together.
Once all cards appear in MAX, do they remain until the machine reboots (even if you log out or in)?
           >> Not positive on this one. I'm 90% sure they come and go, even with just logging in and out.
When cards are missing, does the device manager list the cards under the NI Devices section, or are there any bangs?
           >> Not sure what you are asking here. Is this the "NI-DAQmx Devices" section that is highlighted in the screen shot? The center panel is what is listed when this section header is selected (as shown). What are "bangs"?
Thanks for your help
Bob

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