GWT 2.5.1 is what's actually tested against nightly, but there are no major incompatibilities with GWT 2.6 or 2.6.1 we're aware of.
GWT 2.7.0 dropped support for script tags in the default linker, which will affect some SGWT Projects. A custom "post" linker was added in SGWT 5.1d to provide support for legacy projects, but this hasn't yet been ported to older versions.
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