I'm having a similar issue with a few links in an email not working when the mkt_tok function is enabled. While leaving the "include mtk_tok" option unchecked fixes the broken link (Sanford Whiteman's quick fix), a workaround with the tracking function would be ideal.
Moreover, the links with the mkt_tok seemed to be working fine a couple days ago. No changes were made to the email since then. Links with the mkt_tok also work fine when I send myself a sample of the draft, but do not work when I send myself a sample after approval. Any idea as to why and how these issues occur?
Working link w/o mtk_tok
Broken Link w/ mtk_tok
Different working link (same domain) w/mtk_tok