Hum. .. well, the blank page is not printed almost anytime ... is printed almost a "random mode"... The blank page (in the matter of fact, the page has the header printed, only that) is the last one of the report.
I've tried to modify the footer sizes, without any sucess.

I'll try to explain the case..

The groups in the reports are disposed like that:

group header - eof()
group header - eof()
group header - eof()
group header - eof()
group header - eof()
detail
- information to be printed
detail
signatures 1, 2
group footer - eof()
signatures 3, 4
group fotter - eof()
signatures 5, 6
group fotter - eof()
signatures 7, 8
group fotter - eof()
sugnatures 9, 10
gruop footer - eof()

page footer

I observed one thing, when report will print a footer, he first try to allocate all footer in the page, after that he process it.. and when it occurs, nothing is printed, 'cause the control variables do not allowed it.
So, in this process, we got a blank page.