Hobo 1.4 <delete-button> NoMethodError

[Jim Harvey]

I've got this call to <delete-button> in one my index.dryml files:

<delete-button image="delete.png" update="self" title="delete"/>

which is causing this error: undefined method `src' for #<#<Class:0x00000010f58fd8>:0x00000010f313c0>

I had an <image> tag as well which was causing a similar error and had to replace it with this: <%= image_tag "pencil.png", :alt => "Edit" %> for it to work. 

This just started occurring after an upgrade to 1.4. Let me know if there is something I need to change or if this could be a bug. Thanks,