When updating plugins via admin area, cb subs says 4.5.3 is latest and installed but in another area it says 4.5.4 is latest. Which is it? is there a mistake in versioning?
There is no CBSubs 4.5.4, and probably won't be, as next will most probably be 4.6.0.
I just checked latest versions information systems, and all seem up to date.
The version information at top of CBSubs was not checking for nightly builds until very latest nightlies, while the plugins checker were checking for nightly builds since long time.
But where exactly did you see a CBSubs version 4.5.4 ?