roof guttering leaking it looks like from where there is joining sections is this a clip issue or worse?

1869lady, October 2011

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Steve Jones, August 2012

If plastic type, I would think clip issue, Thats all that stops it leaking at that point, the clips have seals around, that lock onto the guttering to stop leaks.
Old metal type etc, I believe used some sealant, at the overlap if they needed to join 2 sections, not sure, but again, seal of the joint issue.

SD, October 2011