Created attachment 26026 [details]
Excel file to reproduce issue

I'm using POI 3.7 beta 2

When opening the attached Excel file with the following simple code:

InputStream is = file.openInputStream();
try {
    Workbook wb = WorkbookFactory.create(is);
} catch (InvalidFormatException e) {
} finally {
    is.close();
}

the following stack trace is thrown:

java.lang.IllegalStateException
at java.util.AbstractList$Itr.remove(AbstractList.java:356)
at org.apache.poi.hssf.record.aggregates.PageSettingsBlock$1.visitRecord(PageSettingsBlock.java:666)
at org.apache.poi.hssf.record.aggregates.CustomViewSettingsRecordAggregate.visitContainedRecords(CustomViewSettingsRecordAggregate.java:71)
at org.apache.poi.hssf.record.aggregates.PageSettingsBlock.positionRecords(PageSettingsBlock.java:659)
at org.apache.poi.hssf.model.InternalSheet.<init>(InternalSheet.java:230)
at org.apache.poi.hssf.model.InternalSheet.createSheet(InternalSheet.java:162)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:273)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:187)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:304)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:285)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:60)


I cannot share the contents of the Excel file and so I removed it.  It is still reproducing though.

This Excel file can be opened up fine using POI 3.6 libraries