This should not happen from a cedar tube liner. There are two kinds of Spainish Cedar, one of them is called Weeping Spainish Cedar. This type will produce a sap and should never be used wih cigars. It sounds like the manufacturer got a hold of some of this type in error. Here is a description from Internetlumber.com:
Spanish Cedar Wood
"Spanish Cedar wood is a popular Central and South American wood that was harvested centuries ago by Indians in the Amazon region for use in building canoes. Today, this wood is still popular for boat building purposes, and has expanded its influence to North America as well. Spanish Cedar is a widely used choice for furniture, musical instruments, and cigar humidors.
There are some special considerations to keep in mind when fashioning cigar humidors out of Spanish Cedar, however.
You must ensure that you choose a variety of this wood that is non-weepy (full of sap). Most companies only carry this kind, but it is important to make sure because if the wood has a lot of sap, it can ruin your cigars at high temperatures.
Spanish Cedar is a very fragrant wood with a cedar-like smell. Despite its name, however, Spanish Cedar is actually not cedar at all. It comes from a deciduous tree that produces an oil that gives off the decidedly cedar smell. This is how the tree got its name. The wood of the tree is pinkish-red and will deepen in color over time. Its uniform texture and fine grain make it a truly beautiful wood to behold. "
I would think it would not make the cigar unsmokable but would give it an unatural cederay flavor. I hope this helps!