You changed to Yosemite but did you re-install DW?
Reinstalled but still the same
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Did you kill the old DW Preferences as recommended?
Did you redefine your site?
Do you have Java SE6 on your system? Yosemite ships with 8 but DW needs 6.
Java SE 6 Direct download:
DW connects after reinstall and restart. Thank you.