Chart scale error

I am coding a logging system in labview 7.1
On the front panel I have several charts. If I try to change the x-scale by typing new end of scale value while running - labview crashes (LV7.1 has encountered an error, please tell Microsoft...)
If I change the x-scale when the program is not running - labview sometimes crashes.
The graphs are indicators OWGraph, Wave Height, Temperatures, Flow and in the lower loop, pressure difference.
The data comes from on demand aquiring from a pci6120 card which runs in one loop - the displaying is handled in another loop (on top in posted code image) except from one chart which needs quicker updates.
Attachments:
code1.gif ‏158 KB
code2.gif ‏51 KB

I found the sinner, it cant handle the offset. I use an offset of the number of seconds since 1904... to display the current time on the x-axis. If I plot two or more plots in the chart and use property node-> x-axis.offset it crashes every time I try to manually change the x-axis. I used most of the day figuring this out and the rest of the day to find a workaround. Since I dont use the date - I ended up calculating the smallest number of seconds to put into offset so that the time got right. Because if you wire a constant (any size) into the property node it is no problem - if you wire a time stamp converted to double - it crashes. When I use a probe on the value, it displays it in scientific mode (3,2 e+9) I wouldnt think this is any different than a constant written 3200000000 - but it is the only explanation I have right now - and I am not using one more second to find out - cause my workaround works...
In the code attached - the timestamp is input to a chart with a single plot, that however causes no problems...
Attachments:
code3.gif ‏19 KB

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