[NTG-context] linecorrection and paragraph spacing

Some time ago Hans recommended the use of \startlinecorrection...\stoplinecorrection surrounding a figure. Typically I write a paragraph and then have a double carriagereturn and then a floating figure and then a double carriagereturn. The normal paragraph space does not always appear so I surround the figure by linecorrection and then find that the paragraph spacing is slightly larger than usual. Are there any rules for this. If necessary I will try to produce a minimal example although I tend to notice the problem once a document has become fairly long. TIA -- Nigel