I've run into this problem in several Debian/Ubuntu based distros, installing onto an Intel motherboard with built in VESA video adapter. The solution seems to be to force the Dots Per Inch (DPI) setting to about 102, but I haven't been able to find this in Rescatux.
I have found a work around. This involves finding the font selections, and setting them to about 20 or 24 points. Here are the steps I followed:
After allowing Rescatux to boot fully,
click on the mountain icon in the lower left of the screen,
click on Preferences, the 3rd icon from the bottom,
click on Appearances, the top icon in the list,
click on Fonts, in the bottom left of the window that pops open. Set the font selection to a size you can see. I found 20 to 24 point fonts were readable.
Click OK, and then Close to close that window.
Then work through the same process,
click on the mountain icon in the lower left of the screen,
click on Preferences, the 3rd icon from the bottom,
click on Openbox Configuration Manager, the 2rd icon from the bottom,
click on Appearance, the 2nd item from the top on the left side of the window, and set all of the fonts at the bottom of the window to a size you can read.
That still leaves a few items on the bottom toolbar/status bar in unreadable fonts, but I can work with the items that I need to be able to read.
