Problem with smartcard redirection in rdesktop 1.7.x against Windows 2008R2

We're running some Windows 2008R2 terminal server machines, and we use "SITHS" cards (smartcards for Swedish healthcare stuff) that require a Net iD application from Secmaker to work.
In rdesktop 1.6.0 all this works fine. I can log in with a redirected smartcard, and it will work nicely in the RDP session. 

However, with rdesktop 1.7.x, the Net iD application hangs as soon as a card is present in the reader. Logging in without a card lets the Net iD app see the reader hardware, it's just when it tries to access a card it freezes.I can't see any output in the terminal from rdesktop when this happens.

I have tested on a Windows XP machine as well, and logging in to that everything works as expected.
This has been tested on Ubuntu 10.04, and Ubuntu 11.10 with pcscd-lite 1.5.3 and 1.7.2 respectively. 
We're also using some IGEL UD9-730LX terminals, so this appears to have broken in later updates of the firmware for those as well.

Not sure where to go from here...

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