Wipeoutframe resets to "1" each time the file is opened

Hi,

I'm having some trouble with my CAD files recently. I have typically been using wipeouts within blocks for quite some time and always kept the variable for all my frames set at "2", visible but not printing. Since last night, each time I open a file, the wipeoutframe has been reset to "1", visible and prints, where the others are untouched. This is proving to be a very annoying factor to work around as we are preparing sets to be sent out for print soon. I have checked the FRAMES variable and that resets to "3" even if I try to set that at "2". 

Is there another system variable I am missing or may have accidentally changed?

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