Apparent altered DIO line input state on 4351 when using driver instead of NI MAX

Hi,
I'm using an NI4351 PCI DAQ card with the Ni435x driver and LabWindows/CVI v5.5 (on Windows 98) to capture digital logic states on the DIO lines. I first used NI's MAX utility to establish a virtual DAQ input channel from 'Data Neighborhood'. When I tested this channel from the utility by connecting the DIO line to 5V or GND via a 10K resistor, the respective logic levels were registered. In LabWindows, I use the 'NI435X_Init' and 'NI435X_Configure_Digital_Lines' driver functions to respectively initalize the DAQ card and set one of the DIO lines as an input, with the rest being set as outputs. However, I cannot read the input line using 'NI435X_Read_Line' unless I directly connect th
is channel to 5V or GND (i.e. without a 10K resistor), but 'NI435X_Write_Line' works fine. It would appear that the input state of the DIO line is different to that established by NI MAX. Is there something other than the initialize function that should be called? I tried the following linemask combinations to set the port lines, by using F or 1 to represent an output and 0 to represent an input:
NI435X_Configure_Digital_Lines(DAQ_session, 0x0FFFFFFF) // DIO 0 set as input, the rest as outputs
NI435X_Configure_Digital_Lines(DAQ_session, 0x01111111) // DIO 0 set as input, the rest as outputs
I am unsure which format, if either, is correct and would be grateful for any help on this anomaly. Thanks.

Hi Kevin,
Yes, if I connect an input channel directly to 5V, the software reads a logic high and continues to read this level even when I disconnect the channel and leave it "floating". The state changes to logic low only when I connect the channel directly to GND and then it stays at this level, even if I disconnect it from GND. In other words, the states seem to 'latch'. Nothing happens if I connect via the 10K resistor - the channel simply remains at the logic level it was last set to after I momentarily connected it directly to 5V or GND.

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Apparent altered DIO line input state on 4351 when using driver instead of NI MAX

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