When importing old config files (from 1.2.9) to slic3r 1.3.0 you maybe have set the temperatures in filament profil setting only to first layer temp.
this was in previous versions working fine, but now you need to specify bed plate temperatur after first layer not to be zero, because now this setting will switch the bed heater off.
So if you experiencing loose prints after change to 1.3.0 it could be about bed heating drops after frist layer.
Its not a bug, because ist was in changelog: "Bed temperature can now be specified at 0."
On older versions it had only be specified for first layer and second setting can be at zero, which made the printer heat along the full print with start layer temperatures.
CTC 3D Drucker, fabrikator II mini, ultimaker-diy,
Modifizierter Prusa I3 Boxed.
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