Thanks for your investigation on this issue.
This problem generally appears when TextBox control crosses multiple pages, along with having Zero(or very less)
page margins. However, the occurrance of this issue fully depends on layout of the report(size & position of controls) and Page Settings(Margins etc).
To avoid cutting of text in such scenarios, you are suggested to set the page margins to some considerable value. You might need to do calibration of values while setting Margins, TextBox position, size etc.
Unfortunately, it is not possible to detect occurrence of such issues using some tool/custom code etc.
To avoid cutting of Text, we have made following changes in the reports provided by you:
Modified_testCase1.rpx -- Set Top margin to '0.06 in' instead of '0.00 in'
Modified_testCase2.rpx -- Set Top margin to '0.06 in' instead of '0.00 in'
Modified_testCase3.rpx -- Set Top margin to '0.06 in' instead of '0.00 in'
Modified_testCase4.rpx -- Set Top margin to '0.06 in' instead of '0.00 in'
Modified_testCase5.rpx -- Set Top margin to '0.25 in' instead of '0.00 in'
Modified_testCase6.rpx -- Set Top margin to '2.00 in' instead of '0.50 in'
Modified_testCase7.rpx -- No change in Margin, remove overlapping of TextBoxes(TextBox1.Y = 9.33 in)
Modified_testCase8.rpx -- Set Top margin to '0.80 in' instead of '0.60 in', set 'WrapMode' property of TextBox2 to 'WordWrap'.
You can note that, by making minor changes in the layout of report, cutting of text can be avoided. Modified reports are attached.
Thanks & Regards 2016/01/Modified-Reports.zip