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I'm having some trouble squashing some bugs in my iPhone application and I have come to the realisation that I'm not entirely clear on what the significance of a variable being highlighted in red?

Does it mean the variable no longer exists?

+3  A: 

It means that the value has changed since the last time a breakpoint was reached or your last step, to make it easy to see how your variables are changing over the lifetime of your program.

Kevlar
It's seems that the red text I'm referring to is in the summary column. I don't have any break-points set, the program is just crashing at that point... i.e identifier | NSCFString * | 0x54270 | [red]J20TextCellMiddle[/red]What does the red signify here as I didn't set a previous breakpoint?
Tricky