Spanned tables locks up ID CS5

i started laying out book has multiple large tables flow regular text.  i've applied spanning style paragraph contains table flow text in 2-column layout.  ever since applying style, id has become sensitive. if try resize text box contains table, spinning cursor , id never recovers . . . have force quit , restart. if edit table text style in way causes table have reflow, same lock up. if "select all" in side story , cut , make changes style or text box , paste text story, app not lock up. text tables came ms word, i've reformatted using cell styles , exported entire file idml , opened try , clear out corruptions. i've worked smaller tables in id cs5, first time working large tables , using spanning columns feature. has else run problem or have run fluke?

 

cs5 on mac 10.5.8

i'm positive issue in spanning option.  had page table flowing on regular 1 column textframe.  table empty--i had cleared of content accept row , column headers. clicked on textframe , on 2 column object style , id locked up. cannot change table style @ all--even text cut clipboard--when paste text after changing style, id locks up.

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